Ask question

Ask question

All categories

3 years ago

10

I need help in Kahn academy

2 answers:

gulaghasi [49]3 years ago

7 0

First, convert the mixed fractions into improper fractions:

3 $\frac{1}{8}$ = $\frac{8(3) + 1}{8}$ = $\frac{25}{8}$

1 $\frac{2}{3}$ = $\frac{3(1) + 2}{3}$ = $\frac{5}{3}$

Next, divide a fraction by multiplying by the reciprocal:

$\frac{25}{8}$ ÷ $\frac{5}{3}$ = $\frac{25}{8}$ x $\frac{3}{5}$ = $\frac{25(3)}{8(5)}$

Lastly, simplify the fraction:

$\frac{5(3)}{8}$ = $\frac{15}{8}$

Answer: $\frac{15}{8}$ = 1 $\frac{7}{8}$

Alex17521 [72]3 years ago

4 0

Please post your question.

You might be interested in

You have 600 feet of fencing to enclose a rectangular plot that borders on a river. If you do not fence the side along the river

inn [45]

Answer:

The length and width of plot is $L=300\:ft$ , $W=150\:ft$

Largest area of the plot is $A=45000 ft^{2}$

Step-by-step explanation:

Assume width as x and length as y. Given that length of fencing is 600 feet and fencing is enclosed on 3 sides. So perimeter is given as,

Perimeter = width + length + width

Substituting the value,

$600=x+y+x$

$600= 2x+y$ ….1

Now area of fence of rectangular box is given as follows,

$A=xy$ ….2

Solving equation 1 for y, subtracting 2x from both sides,

$600-2x= y$

Substituting the value in equation 2,

$A=x\left (600-2x \right )$

Simplifying

$A=600x-2x^{2}$

Rewriting,

$A=-2x^{2}+600x$

Above equation looks like quadratic equation $f\left ( x \right )=ax^{2}+bx+c$ whose graph looks like parabola.

Comparing equation f(x) and A values of a, b and c are, $a=-2,b=600$ and $c=0$ .

Now maximum of $f\left ( x \right )$ occurs at vertex.

The x coordinate of the vertex is given as $-\dfrac{b}{2a}$

Substituting the values,

$x=-\dfrac{600}{2\left (-2 \right )}$

Simplifying,

$x=\dfrac{600}{4}$

$x=150$

So width of plot is 150 feet.

Now to calculate value of length by using equation 1,

$600= 2x+y$

Substituting the values,

$600= 2\left (150 \right )+y$

$600= 300+y$

Subtracting 300 from both sides,

$300= y$

So length of plot is 300 ft.

The y coordinate of the vertex is given as $y=f\left ( -\dfrac{b}{2a} \right )$ which also means, $y=f\left ( 150 \right )$

$\therefore A=-2\left (150 \right )^{2}+600\left (150 \right )$

Simplifying,

$\therefore A=-2\left (22500 \right )^{2}+600\left (150 \right )$

$\therefore A=-45000+90000$

$\therefore A=45000$

So, area of the plot will be $A=45000 ft^{2}$

7 0

3 years ago

Kim wants to buy art supplies that normally costs $50, but are on sale for 20% off. What is the sale price for the art supplies?

stepan [7]

Answer:

$40

Step-by-step explanation:

100% - 20% = 80%

80% of $50 = 0.8 × $50 = $40

4 0

1 year ago

Question is in the picture:)

Bingel [31]

Answer: It would probably be 30

Step-by-step explanation:

The ratio is 10:0 , 20:10 , 30:20 , 40:30 , 50:40, 60:50 , etc…

so basically you just need to know the ratios!

Hope I could help :)

6 0

2 years ago

Read 2 more answers

Which statements are true?

Nimfa-mama [501]

All rectangles are parallelograms. Hope this helps.

4 0

3 years ago

Read 2 more answers

A lamborghini traveled 220 miles in 4 hours. How many miles does the lamborghini drive per hour (speed)?

Aleonysh [2.5K]

Answer:

55 mph

Step-by-step explanation:

220m per 4 hours

so 220 devieded by 4 gives u your answer

6 0

2 years ago

Read 2 more answers